Spelling fixes

Mostly comments, but includes user-visible debug messages.
(cherry picked from commit b0c4a87133)

elab_expr.cc

@@ -686,7 +686,7 @@ NetExpr* PEBinary::elaborate_expr_base_rshift_(Design*des,
 	    }
 
 	      // Special case: shift is negative (so do a left shift)
-	      // and is greater then the output width. Replace the
+	      // and is greater than the output width. Replace the
 	      // expression with a constant-0.
 	    if (shift < 0 && (0-shift) >= use_wid) {
 		  if (debug_elaborate)
@@ -2265,7 +2265,7 @@ NetExpr* PEIdent::elaborate_expr_param_part_(Design*des, NetScope*scope,
 
       if (! parts_defined_flag) {
 	    if (debug_elaborate)
-		  cerr << get_fileline() << ": debug: Part select of paramter "
+		  cerr << get_fileline() << ": debug: Part select of parameter "
 		       << "has x/z bits, so resorting to 'bx result." << endl;
 
 	    long wid = 1 + labs(par_msv-par_lsv);

eval_tree.cc

@@ -133,7 +133,7 @@ NetExpr* NetEBAdd::eval_tree(int prune_to_width)
 
 	    if (debug_eval_tree) {
 		  cerr << get_fileline() << ": debug: "
-		       << "Partially evalutate " << *this
+		       << "Partially evaluate " << *this
 		       << " using (a+2)-1 --> (a+1) transform." << endl;
 	    }
 

tgt-vhdl/stmt.cc

@@ -552,7 +552,7 @@ static void get_nexuses_from_expr(ivl_expr_t expr, set<ivl_nexus_t> &out)
 /*
  * Attempt to identify common forms of wait statements and produce
  * more idiomatic VHDL than would be produced by the generic
- * draw_wait funciton. The main application of this is a input to
+ * draw_wait function. The main application of this is a input to
  * synthesis tools that don't synthesise the full VHDL language.
  * If none of these patterns are matched, the function returns false
  * and the default draw_wait is used.

tgt-vvp/eval_expr.c

@@ -1853,7 +1853,7 @@ static struct vector_info draw_number_expr(ivl_expr_t exp, unsigned wid)
 
 /*
  * This little helper function generates the instructions to pad a
- * vector in place. It is assumed that the calling functio has set up
+ * vector in place. It is assumed that the calling function has set up
  * the first sub_sidth bits of the dest vector, and the signed_flag is
  * true if the extension is to be signed.
  */
@@ -2456,7 +2456,7 @@ static void draw_select_expr_dest(ivl_expr_t exp, struct vector_info dest,
 
 	/* If the shift expression is not present, then this is really
 	   a pad expression, and that can be handled pretty
-	   easily. Evalutate the subexpression into the destination,
+	   easily. Evaluate the subexpression into the destination,
 	   then pad in place. */
       if (shift == 0) {
 	    struct vector_info subv;

vvp/vvp_net.cc

@@ -3399,7 +3399,7 @@ ostream& operator <<(ostream&out, vvp_scalar_t a)
 
 /*
  * This function is only called if the actual interface function rules
- * out some of the eazy cases. If we get here, we can assume that
+ * out some of the easy cases. If we get here, we can assume that
  * neither of the values is HiZ, and the values are not exactly equal.
  */
 vvp_scalar_t fully_featured_resolv_(vvp_scalar_t a, vvp_scalar_t b)